A Bellaire man who has been charged for allegedly having sex with a 16-year-old girl at his Crosby car dealership is the same gun-toting Good Samaritan who single-handedly caught an armed burglar with the help of his .50-caliber handgun, and used the crime-busting incident in ads for his dealership.

Riku Pekka Melartin, 51, has been charged with sexual assault of a child in an incident with a girl who was helping her mother clean the dealership, according to the criminal complaint filed by the Harris County District Attorney's Office. In a separate incident with the same girl, George Maroun Koutani, a 37-year-old Houston man and Melartin's assistant at the dealership, is charged with indecency to a child.

On Feb. 13, 2012, Melartin rescued a neighbor who had been robbed at gunpoint in the 5300 block of Holly Street by shooting at the ground and then holding his gun on the thief until authorities arrived. Joseph Anthony Smith, 20, of Houston, was arrested after that incident.

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In commercials for John Keating Chevrolet in Crosby made after the robbery, Melartin appears like an action hero on screen saying, "If there's a bad guy in my neighborhood, I say, not on my watch." And then, "If there's a damsel in distress, I say, not on my watch." The ad shows Melartin in various poses with his handgun at the dealership and at a nearby gun range.

Melartin was not in custody on Wednesday, according to online law enforcement records. KHOU-TV (Channel 11) reported Wednesday afternoon that Melartin "has not been seen in days."